What have you got on it now? A lot of the varmint rifles I see from the manufacturers have bull barrels, ranging anywhere from 16" to 24". Tango built a real nice varmint rifle a little while ago, maybe he's got some better info

I don't know, I was just thinking about swapping out the barrel with a better, more accurate one. I don't want to reinvent my whole rifle other than that.

Regarding just swapping out the whole upper......then that brings up the question....what do I do with the old one? I HATE trying to sell stuff on eBay or GunBroker. Hate it.

And the doo-hickey.....it's very tempting, and I'd love to have one....but I "built" my AR about a year ago and don't have the need for another one. But I'm a big fan of doo-hickeys in general. Hell, who isn't?